
	Where results make sense

Topic: Time constant

Related Topics

e mathematical constant

gravitational constant

cosmological constant

Boltzmann constant

mathematical constants

magic constant

fine structure constant

Benjamin Constant

Euler Mascheroni constant

Constant Fornerod

Jean Ren Constant Quoy

equilibrium constant

In the News (Tue 14 Feb 12)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	Time constant - Wikipedia, the free encyclopedia
		The resistance across the membrane is a function of the number of open ion channels and the capacitance is a function of the properties of the lipid bilayer.
		The time constant is used to describe the rise and fall of the action potential, where the rise is described by
		The larger a time constant is, the slower the rise or fall of the potential of neuron.
	en.wikipedia.org /wiki/Time_constant (454 words)

	Archived -- Prisoners Of Time
		As time runs out on the teacher, perceptive students are left to wonder about the integrity of an instructional system that behaves, year-in and year-out, as though the last chapters of their textbooks are not important.
		By relying on time as the metric for school organization and curriculum, we have built a learning enterprise on a foundation of sand, on five premises educators know to be false.
		Time, the missing element in the school reform debate, is also the overlooked solution to the standards problem.
	www.ed.gov /pubs/PrisonersOfTime/Prisoners.html (1928 words)

	Planck time - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-20)
		The Planck time is the time it would take a photon travelling at the speed of light to cross a distance equal to the Planck length.
		However, this may not be taken as a "quantum of time".
		Shortest time interval measured - coverage of 2004 event on BBC news.
	en.wikipedia.org /wiki/Planck_time (215 words)

	External constant specification in a digital electronic system (US4829458)
		The time constant of the constant specifying resistor and a capacitor is measured by discharging the capacitor, charging the capacitor through the constant specifying resistor and counting the number of predetermined time intervals required for the voltage across the capacitor to reach a predetermined threshold voltage.
		A similar time constant measurement is made for the reference resistor and the capacitor.
		The externally specified constant is computed from the digital ratio of the time constant of the constant specifying resistor and the time constant of the reference resistor.
	www.delphion.com /details?patent_number=4829458 (377 words)

	Argentum Solutions Inc. - Sterling Guidance on Corrosion and Materials Degradation (Site not responding. Last check: 2007-10-20)
		The constant phase element arose during early studies in the 1940’s of dielectrics and was attributed to a combination of dispersion and absorption.
		The result is often modeled as a phenomenological "RC" time constant the value of which may or may not be associated with one actual physical process.
		Use of constant phase element may be the only viable approach to extracting needed values from the impedance spectra when the complex chemistry prevents a kinetic model from being developed or when time and money preclude an extensive study.
	www.brick.net /~argentum/tutorials/impedance_tutorialpg4.html (904 words)

	[No title]
		The time constant is defined as the time it takes for the voltage to drop to 37% of its original value (when the voltage is 1/e of its original value, e being the number 2.718...).
		In this case, the time constant can be defined as the time it takes the voltage to rise to 63% of its maximum value, providing a method for finding the time constant.
		Calculate the time constant for an RC circuit consisting of a 1µF capacitor and a 1 MW resistor.
	www.olemiss.edu /courses/phys215/documents/labs/word/rc_time_constant.doc (1370 words)

	Definition: time constant (Site not responding. Last check: 2007-10-20)
		time constant: The interval required for a system or circuit to change a specified fraction from one state or condition to another.
		where A (t) is the value of the state at time t, A (0) is the value of the state at time t = 0, a is the time constant, and t is the time that has elapsed from the start of the exponential decay.
		A system is considered to have changed its state after the elapse of three time constants, which corresponds to a 95% change in state.
	www.atis.org /tg2k/_time_constant.html (196 words)

	1999; Age adjusting the vestibular-ocular reflex time constant (Site not responding. Last check: 2007-10-20)
		Firstly, the VOR time constant is significantly correlated with age in such a fashion that it rises from birth, hits a peak age and then begins to decrease.
		Secondly, because paramaters B4 and B5 are constant regardless of group, the VOR time constant of patients being tested can now be age adjusted, without prior knowledge of the pathology of their vestibular system.
		This allows for a given patient's VOR time constant to be compared to patients of a similar age group, thereby increasing both the accuracy and precision of VOR time constant abnormality detection.
	www.aro.org /archives/1999/461.html (336 words)

	Is the Velocity of Light Constant in Time?
		The possibility that the velocity of light, c, is not a fixed constant is reconsidered by statistical analysis of the historical measurements collected from four sources.
		From the times of the ancient Greek philosophers until Galileo light transmission was regarded as instantaneous---that is, the velocity of light, c, was assumed to be infinite.
		In all cases the trends in "h constants" are in the appropriate direction.
	www.ldolphin.org /cdkgal.html (3446 words)

	constants : Java Glossary (Site not responding. Last check: 2007-10-20)
		Compile time constants are evaluated at compile time, and treated as if they were literals, inlined in the code.
		This means if class A uses class B's compile time constants, and you change the values of those constants in class B, class A still has the old values embedded all through it, inlined, until it is recompiled to refresh the values.
		The JLS tends to use the term constant to refer only to interface constants which can be either compile time or run time, or to enum constants.
	mindprod.com /jgloss/constants.html (1172 words)

	Meteorological Time Defintion - The use of the Universal Time Constant for meteoroligical & hydrological data.
		Meteorological Time Defintion - The use of the Universal Time Constant for meteoroligical & hydrological data.
		These times [the times of preparation, transmission and the forecast valid time] are expressed in UTC.
		Hence, the time in the bulletin heading will be the standard time, usually ending in minutes of zero (00), and the first time within the forecast will be the preparation time and will end in 30, representing 30 minutes after the hour.
	www.nws.noaa.gov /tg/time.html (536 words)

	Constant Comprehension
		The symbols you define for compile-time constants are replaced with the value of the constant at compile time.
		This is the main point to compile-time constants: These symbols don't exist in the IL, only in your C# source.
		For one thing, run-time constants can be of any type; as long as you can assign them in your constructors, they will work.
	www.aspnetpro.com /newsletterarticle/2004/05/asp200405bw_l/asp200405bw_l.asp (1036 words)

	time constant
		In the second diagram, a resistor R has been placed in series with C. When the switch is closed, C charges from the battery, as described previously.
		If we draw a graph of the increase of capacitor voltage against time, then we get a curve that is not linear (not a straight line).
		Time constants are often used where a time delay is required.
	ourworld.compuserve.com /homepages/g_knott/elect38.htm (376 words)

	Thermister Thermal Time Constant - Thermistor and NTC Thermistor Specialists: BetaTHERM
		The Thermal Time Constant for a Thermister is the time required for a Thermister to change its body temperature by 63.2% of a specific temperature span when the measurements are made under zero-power conditions in thermally stable environments.
		The definition of Thermal Time Constant arises from the exponential nature of the rate of transfer of heat between the Thermister and the medium that it is monitoring.
		It is similar in principle to the definition of time constants in describing the responses of systems where physical effects have an exponential response with respect to time.
	www.betatherm.com /tc_thermister.htm (568 words)

	[No title]
		Use the graph to view the charge cycle time of the 0.63V position (the position where the voltage is 63% of the 4 Volt input.) Repeat step “e” for 4 more data points.
		A second time constant was generated using the slope of a plot of ln[1-V(t)/Vmax] function vs. time for 4 data points along the charge cycle.
		A second time constant was generated by using the slope of a plot of ln(V(t)/Vmax) vs. time.
	www.geocities.com /yoda3502000/school/RCcircuit.doc (384 words)

	RC Time Constant
		The time required to charge a capacitor to 63 percent (actually 63.2 percent) of full charge or to discharge it to 37 percent (actually 36.8 percent) of its initial voltage is known as the TIME CONSTANT (TC) of the circuit.
		The value of the time constant in seconds is equal to the product of the circuit resistance in ohms and the circuit capacitance in farads.
		If the time constant and the initial or final voltage for the circuit in question are known, the voltages across the various parts of the circuit can be obtained from the curves for any time after the switch is closed, either on charge or discharge.
	www.tpub.com /neets/book2/3d.htm (697 words)

	Constant Interaction-Time Scatter/Gather Browsing of Very Large Document Collections (Site not responding. Last check: 2007-10-20)
		Quadratic running time is clearly too costly for interactive manipulation of the collections we envision, containing thousands of documents, possibly requiring days or even months to perform a single clustering.
		The constant time bound is thus maintained through iterations.
		Thus a similarity computation could be treated as a constant time operation when we were considering only individual documents, because their profiles are all of bounded size.
	www2.parc.com /istl/projects/ia/papers/sg-sigir93/sigir93.html (3667 words)

	The Time Dilation - what das it mean ?
		Anyway, such explanations show us symmetry in time dilatation effect and for non symmetrical time observations it is necessary to use considerable time changes when we change inertial system or we are moving with acceleration.
		The metre is the length of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a second.
		Talking something about "real" time from the point of STR lead to results, whose break the rule of the constant speed of light, which is the base rule of STR..
	www.geocities.com /Athens/Forum/1755/my_relat.html (2523 words)

	Embedded.com - Enumeration Constants vs. Constant Objects
		The problem with constant objects is that they pose a small risk of making your programs a little bigger or slower than they would be if you used enumeration constants.
		The crux of the problem with constant objects is that, while an enumeration constant is an rvalue, a constant object is a non-modifiable lvalue.
		Although you can declare an enumeration constant in local or global scope, the declaration's scope is unlikely to affect the way the compiler generates code for the constant.
	www.embedded.com /story/OEG20011129S0065 (1567 words)

	RC time constant
		The approximate amount of time it takes is RC, which is called the "time constant" of the circuit.
		In all cases, the time derivative of a variable is related to itself and therefore the solution is exponential.
		This is the voltage in the capacitor as a function of time.
	othello.mech.northwestern.edu /ea3/book/elec5/RC.htm (1119 words)

	ACEE Lesson Page
		Describe the equation for determining the time constant of a series RL circuit.
		Calculate the L/R time constant of a circuit.
		The time constant for an RL circuit is nothing more than the value of the inductor divided by the value of the resistor..
	www.free-ed.net /sweethaven/modelec/acee/lessonMain.asp?iNum=0402 (460 words)

	[No title]
		Finding a time constant, a second approach Tuning the model Model tuning involves varying a parameter (in this case, the time constant) such that the difference between the experimental results and theoretical prediction is made as small as possible.
		Time constant estimate from the 63% point of the measured response.4.
		Time constant estimate from the slope of the incomplete-response plot6.
	www.rose-hulman.edu /Class/ee/grigg/ES205/Thermocouple_exp.doc (1147 words)

	ACEE Lesson Page
		Describe the equation for determining the time constant of a series RC circuit.
		Calculate the RC time constant of a circuit.
		Explain why a capacitor is considered fully discharged at the end of 5 time constants.
	www.sweethaven.com /sweethaven/ModElec/acee/lessonMain.asp?iNum=1002 (529 words)

	What are Half Lives and Mean Lives?
		Although it's not obvious, it can be shown that in such a situation where the amount of an element halves in a constant time interval, it will also "third" in a different constant time interval that is not hard to calculate.
		Choosing the halving time is conventional because it's unambiguous.
		The label "time constant" is just a name for tau; the fact that the mean life happens to equal tau is a kind of neat coincidence that allows us to think of the mean life in the following, alternative, way.
	math.ucr.edu /home/baez/physics/ParticleAndNuclear/HalfLife/halfLife.html (2899 words)

	Constancy of the Velocity of Light (Site not responding. Last check: 2007-10-20)
		The behavior of the atomic constants and the velocity of light, c, indicate that atomic phenomena, though constant when measured in atomic time, are subject to variation in dynamical time.
		Atomic time is defined in terms of one revolution of an electron in the ground state orbit of the hydrogen atom.
		Physical lengths, as measured by a rigid rod, and physical times, as measured by an atomic clock, are not equivalent to the mathematical lengths and times of general relativity.
	www.ldolphin.org /constc.shtml (3955 words)

	Time-varying time constant (Site not responding. Last check: 2007-10-20)
		The result is an ``instantaneous'' time constant whose value follows the same stereotyped trajectory as R(t).
		It is interesting to note that this time constant starts a very short value--only about 1 msec--and then increases to only 10 msec.
		The fact that this instantaneous time constant is so short implies that cortical neurons integrate their inputs over only a relatively short time.
	www.cnl.salk.edu /~zador/rep_fire_inc/node4.html (100 words)

	System Dynamics - Time Constants (Site not responding. Last check: 2007-10-20)
		Psychologists have measured the time constant that determines how much learned material you retain as a function of time after learning.
		That's when the elapsed time is one time constant.
		Determine the time when the variable would have decayed to zero if the initial rate of decay (slope) had continued.
	www.facstaff.bucknell.edu /mastascu/eControlHTML/SysDyn/SysDyn3TC.html (903 words)

	RC Circuits -- Technical Notes (Site not responding. Last check: 2007-10-20)
		The time constant of an RC circuit is the product of its resistance and capacitance.
		For R in ohms and C in farads, the time constant t is in seconds.
		Rise Time: Time required to go from 10% to 90% of Vout.
	www.evergreen.edu /biophysics/technotes/electron/rc.htm (62 words)

	Displaying constants format in Query/400 (Site not responding. Last check: 2007-10-20)
		The Display Constants Format display shows you what date or time format you must use if you specify a date or time constant and do not use an SAA format.
		Change a query from the Work with Queries display and at least one date or time constant is specified in the query definition in an AS/400 format other than the date or time format specified for your job.
		Display a query from the Work with Queries display and your job format for the date or time is different from an AS/400 date or time format constant that is specified in the query definition.
	www.redbooks.ibm.com /pubs/html/as400/v4r5/ic2924/info/db2/rbaf9mst76.htm (207 words)

Try your search on: Qwika (all wikis)